326 Transactions. 



Analthea hexagona, n. sp. 



Hipponyx cornucopia}, Hutton, Cat. Mar. Moll. N.Z., 1873, p. 32 

 (not of Lamarck). Hipponyx australis, Hutton, Journ. de 

 Conch., vol. xxvi, 1878, p. 30 ; Man. N.Z. Moll., 1880, p. 88 ; 

 Proc. Linn. Soc. N.S.W., vol. ix, 1884, p. 939 (not of La- 

 marck). 



This species differs from H. australis, Lamk., in the more 

 or less distinct hexagonal, rarely pentagonal, outline of the 

 aperture. The interior has a light-green central area, which is 

 cinereous or brown in australis, and the margin is light-purple. 

 The radiate riblets, similar to those of australis, are mostly 

 visible only on young specimens ; adult shells are strongly 

 corroded, but incremental lines are sometimes visible. The 

 greatest diameter of the aperture of my largest specimen is 

 22 mm. ; the altitude is extremely variable. 



Hab. — A rock in Tauranga Harbour, and Chatham Islands. 



Type in my collection. 



Calyptraea novae-zeelandiae, Lesson (1830). 



Crepidula (Sigapatella) novce-zeelandics, Lesson, Voy. de la " Co- 

 quille," Zool., vol. ii, 1830, p. 395. Calyptrcea maculata, 

 Quoy and Gaimard, Voy. Astrol., Zool., vol. iii, 1835, p. 422, 

 pi. lxxii, figs. 6-9. 



The name of Quoy and Gaimard being used by the majority 

 of conchologists made me quite forget that Lesson's name has 

 priority. Although his diagnosis was not accompanied by a 

 figure it is quite sufficient to identify the species. 



Calyptraea (Calyptropsis) alta, Hutton (1885). 



Trochita alta, Hutton, Trans. N.Z. Inst., vol. xvii, 1885, p. 329. 

 Calyptrcea alta, Hutton, Pliocene Moll. N.Z., in Macleay 

 Mem. Vol., 1893, p. 62, pi. vii, figs. 59, a, b. 



There are three convex rapidly increasing whorls, ornamented 

 with well-marked rugose growth-lines ; colour light-brown ; 

 aperture rotundate-oval ; septum sinuated near the false colu- 

 mella ; the interior whitish-brown, light-brown radiate bands 

 are sometimes to be found on the septum ; subperforate, only a 

 small chink being left. Diameter : maximum, 32 mm. ; mini- 

 mum, 29 mm. Altitude, 23 mm. 



It will be seen that the recent specimens are larger than the 

 fossil ones (25 mm. by 16 mm.). 



Hab. — A number of specimens, mostly with broken septum, 

 were collected by Mr. McGahey, former lighthouse-keeper at 

 Cape Maria van Diemen, and most obligingly presented to me. 



